Steps to Reproduce

run the attached example notify-nested-ref.zul OR notify-nested-ref2.zul
both create the same output
click the left "+1" button
click the right "+1" button

Current Result

the left label age is only updated after the right "+1" button for person 2 is clicked

Expected Result

the age labels should increment individually when either button is clicked

Debug Info

notify-nested-ref.zul shows a simplified scenario using shadow elements
notify-nested-ref2.zul shows the same without using shadow elements, to prove it also happens without shadow elements

the zul files contain comments with additional hints:
e.g. moving the person.name label after the age label will fix the problem for unknown reasons.

Workaround

avoid references partially sharing the same path

e.g. change

person="@ref(couple.person2)"
details="@ref(couple.person2.personalDetails)"

to

person="@ref(couple.person2)"
details="@ref(person.personalDetails)"